Thermoelastic anisotropy in NdScO3 and NdGaO3 perovskites
| Autor: | Steffen Ganschow, L. Peters, Christian Hirschle, Jürgen Schreuer |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Resonant ultrasound spectroscopy
Materials science Condensed matter physics Crystal growth 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Thermal expansion 0104 chemical sciences Condensed Matter::Materials Science Thermoelastic damping General Materials Science Orthorhombic crystal system 0210 nano-technology Anisotropy Single crystal Powder diffraction |
| Zdroj: | Materials Chemistry and Physics. 254:123528 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/j.matchemphys.2020.123528 |
| Popis: | Single crystal thermal expansion and elastic stiffness of NdGaO3 and NdScO3 were investigated by inductive gauge dilatometry and resonant ultrasound spectroscopy between 103 K and 1673 K, as they are used extensively as perovskite-type substrates for epitaxial crystal growth. Thermal expansion of NdGaO3 is in agreement with literature data and has very similar magnitude and anisotropy compared to NdScO3. The anisotropy of the elastic stiffness of NdGaO3 is more pronounced and qualitatively different from what is found for NdScO3. It is explained in terms of structural instabilities, which lead to known phase transitions in other perovskites. The anisotropy of the elastic stiffness of NdGaO3 is compatible with what is found for other orthorhombic perovskites that undergo a transition to a rhombohedral structure at high temperatures. The elastic properties of NdScO3 directly follow from the properties of other R E ScO3. The samples were characterized with regards to their compositions and lattice parameters using electron probe microanalysis and X-ray powder diffraction. |
| Databáze: | OpenAIRE |
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